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Liu W, Zhang X, Ren H, Hu X, Yang X, Liu H. Co-production of spirosiloxane and biochar adsorbent from wheat straw by a low-cost and environment-friendly method. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 338:117851. [PMID: 37019023 DOI: 10.1016/j.jenvman.2023.117851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/29/2023] [Accepted: 03/29/2023] [Indexed: 06/19/2023]
Abstract
To enhance the value of wheat straw derivatives, wheat straw ash (WSA) was used as a reactant for the first time to synthesize spirocyclic alkoxysilane, an important organosilicon raw material, using an energy-saving and environmentally friendly non-carbon thermal reduction method. After spirocyclic alkoxysilane extraction, the biochar in the wheat straw ash prepared an adsorbent for Cu2+. The maximum copper ion adsorption capacity (Qm) of silica-depleted wheat straw ash (SDWSA) was 31.431nullmg/g, far exceeding those of WSA and similar biomass adsorbents. The effects of the pH, adsorbent dose, and contact time on the adsorption behaviour of the SDWSA for Cu2+ adsorption were systematically investigated. The adsorption mechanism of Cu2+ by the SDWSA was investigated using the Langmuir, Freundlich, pseudo-first-order kinetic, pseudo-second-order kinetic, and Weber and Morris models by combining the preliminary experimental data and characterization results. The adsorption isotherm and Langmuir equation matched perfectly. The Weber and Morris model can describe the mass-transfer mechanism of Cu2+ adsorption by SDWSA. Both film and intraparticle diffusion are rapid control steps. Compared to WSA, SDWSA has a larger specific surface area and a higher content of oxygen-containing functional groups. A large specific surface area provides more adsorption sites. Oxygen-containing functional groups react with Cu2+ through electrostatic interactions, surface complexation, and ion exchange, which are the possible adsorption mechanisms for SDWSA. These methods improve the added value of wheat straw derivatives and promote wheat straw ash recovery and centralized treatment. This makes it possible to use the thermal energy of wheat straw and facilitates the treatment of exhaust gases and carbon capture.
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Affiliation(s)
- Wenlong Liu
- School of Energy Science and Engineering, Harbin Institute of Technology, No. 92, West Dazhi Street, Harbin, 150001, China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92, West Dazhi Street, Harbin, 150001, China
| | - Xingwen Zhang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92, West Dazhi Street, Harbin, 150001, China.
| | - Hongyu Ren
- School of Resources and Environment, Northeast Agricultural University, No. 600, Changjiang Street, Harbin, 150030, China.
| | - Xingcheng Hu
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92, West Dazhi Street, Harbin, 150001, China
| | - Xinyu Yang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92, West Dazhi Street, Harbin, 150001, China
| | - Hui Liu
- School of Energy Science and Engineering, Harbin Institute of Technology, No. 92, West Dazhi Street, Harbin, 150001, China.
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Zhang P, Wei X, Zhang Y, Zhan Q, Bocharnikova E, Matichenkov V. Silicon-mediated alleviation of cadmium toxicity in soil-plant system: historical review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:48617-48627. [PMID: 36840874 DOI: 10.1007/s11356-023-25983-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 02/13/2023] [Indexed: 04/16/2023]
Abstract
The contamination of crops by Cd is a worldwide problem that needs to be addressed for minimizing risk for human health. Today, numerous investigations have demonstrated that Si plays a role in reducing Cd toxicity and accumulation in cultivated plants. The evolution of scientific understanding - the Cd behavior in soil and in plant is discussed for the first time. Our analysis evidences that the research on Si-Cd interactions in the soil-plant system has quickened only in recent years, although basic interactions between silicic acid and Cd cations in aqueous systems were studied over 40-50 years ago. Today, numerous direct and indirect mechanisms of the Si impact on mobility and translocation of Cd in soil and in plants are reported. More productive studies in this area are those that considered the soil-plant system as a whole. Analysis of the development of the Cd-Si-related ideas suggests the prospects of further studies aimed at finding synergetic action of Si and other substances on Cd behavior in the soil-plant system.
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Affiliation(s)
- Pengbo Zhang
- Hunan University of Finance and Economics, Changsha, 410205, China
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Xiao Wei
- Hunan University of Finance and Economics, Changsha, 410205, China
| | - Yangzhu Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Qiang Zhan
- Hunan University of Finance and Economics, Changsha, 410205, China
| | - Elena Bocharnikova
- Institute Basic Biological Problems Russian Academy of Sciences, Pushchino, 142290, Russia
| | - Vladimir Matichenkov
- Hunan University of Finance and Economics, Changsha, 410205, China.
- Institute Basic Biological Problems Russian Academy of Sciences, Pushchino, 142290, Russia.
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